JP3776473B2 - Telephone - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to unauthorized use in an IC card system, and more particularly, to a telephone (reader / writer) that can prevent leakage of an electrical signal to the outside and input of an unauthorized signal from the outside.
[0002]
[Prior art]
IC cards are attracting attention as new information recording media, in particular as information recording media replacing magnetic cards, and are becoming increasingly popular.
An IC card is a small card in which an IC module in which a memory and an electrode are integrated is mounted. Conventionally, an IC card is used as an IC prepaid card in an IC card system that is used by inserting an IC card into a telephone. Yes.
An IC card system using a telephone using an IC card is a system in which a user purchases an IC prepaid card as necessary, places the card in a public telephone, and makes a call. The public is a reader / writer (R / W). The telephone reads the frequency in the memory of the IC card by an electric signal, and controls continuous disconnection of the call according to the remaining frequency.
However, as shown in FIG. 2, there is a problem that even if an illegal wiring is connected to the terminal of the IC card and an IC breadboard (evaluation board) is used, it can be used.
In order to cope with this, in the case of this system, a lid for detecting unauthorized wiring is conventionally used in order to prevent leakage of an electrical signal that connects the unauthorized wiring to the terminal portion of the card and reads the electrical signal to the outside. A method of providing it at the entrance of the reader / writer has been adopted.
[0003]
[Problems to be solved by the invention]
However, with this conventional method, the public telephone needs a movable part for opening and closing the lid, and there is a problem that failure is likely to occur, and it is possible to easily insert an illegal card by breaking the lid. There was a problem.
In addition, when the illegal wiring from the IC card itself is very thin, there is a problem that it cannot be prevented.
Under such circumstances, the present invention provides a telephone (reader / writer) capable of preventing an electric signal leakage to the outside and an input of an illegal electric signal from the outside without causing a failure with a simple structure. It is what.
[0004]
[Means for Solving the Problems]
The telephone of the present invention is a telephone in an IC card utilization system in which an IC card is inserted into a card insertion slot of the telephone and the terminal of the IC card and the contact pin of the telephone are brought into contact with each other. A first feed roller that transports the IC card from the insertion port to the inside of the telephone, and a second feed roller that transports the IC card to a final position where the terminal of the IC card and the contact pin of the telephone can contact (contact). When the card is inserted from the card insertion slot and used, the IC card reaches the second feed roller, moves away from the first feed roller, and starts transporting to the final position. Rotate in the direction opposite to the rotation direction for insertion, detect the number of rotations per specified time, and detect the number of rotations per specified time Only when it is within a prescribed value, and conveys the IC card to said final position, contacting the contact pins on the IC card terminal (contact) is, and is characterized in that the communicating.
[0005]
[Action]
As described above, when the telephone of the present invention is used by inserting the IC card from the card insertion slot, the IC card reaches the second feed roller, moves away from the first feed roller, and is transported to the final position. After starting, rotate the first feed roller in the direction opposite to the rotation direction for inserting the card, detect the rotation speed per specified time, and the detected rotation speed per specified time is within the specified value Only when the IC card is transported to the final position, the contact pin is brought into contact with the terminal of the IC card (contact), and communication is performed, so that communication is performed when a regular IC card without unauthorized wiring is used. In addition, when an unauthorized IC card with unauthorized wiring is used, unauthorized wiring can be detected to prevent the unauthorized IC card from being used.
Specifically, use is made of the fact that the rotation speed of the first feed roller in the direction opposite to the rotation direction for inserting the card is different between when the load is applied due to unauthorized wiring during rotation and when no load is applied. Thus, it is possible to detect the presence or absence of unauthorized wiring, thereby preventing unauthorized persons from leaking electrical signals and inputting unauthorized signals to the outside. In other words, an IC breadboard (evaluation board) in which unauthorized wiring is connected to the terminals of the IC card cannot be used at all.
[0006]
【Example】
An embodiment of the telephone of the present invention will be given and described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of an essential configuration of a telephone according to an embodiment. In FIG. 1, 100 is a public telephone, 101 is a first feed roller, 101A and 101B are rollers, 102 is a second feed roller, 102A, Reference numeral 102B denotes a roller, 103 denotes a rotation speed detection unit, 104 denotes a contact, 105 denotes a contact pin, 106 denotes a card insertion slot, and 110 denotes an IC card.
The public telephone 100 of the present embodiment shown in FIG. 1 contacts the terminal portion of the IC card 110 with the terminal pin 105 of the contact 104 of the public telephone 100 after inserting the IC card 110 from the card insertion slot 106 of the public telephone 100. It is a telephone of a telephone system using an IC card to be used, but each time the IC card is inserted into the card insertion slot of the telephone and used, it is detected whether or not unauthorized wiring is connected to the IC card. It is a telephone to perform.
[0007]
Hereinafter, an operation for detecting the presence or absence of unauthorized wiring will be described with reference to FIG. FIG. 1A is a view when the IC card 110 is inserted from the card insertion slot 106, and shows the IC card 110 being conveyed only by the first feed roller 101, and FIG. Reaches the second feed roller 102, moves away from the first feed roller 101, and starts transporting to the final position, then the first feed roller 101 is opposite to the rotational direction for inserting the IC card 110. It is a figure which shows the state rotated in this direction.
When the IC card is inserted into the card insertion slot of the telephone and used, first, as shown in FIG. 1A, the IC card 110 is first transported by the first feed roller 101, as shown in FIG. At the same time, it reaches the second feed roller 102, moves away from the first feed roller 101, and transport is started only by the second feed roller 102.
At this time, the first feed roller 101 is rotated in a direction opposite to the rotation direction at the time of card insertion, and the rotation number is a predetermined rotation number (N rotations) when nothing is interposed between the rollers 101A and 101B. / Min).
If the inserted IC cart is a legitimate card, nothing is interposed between the rollers 101A and 101B, so the predetermined number of revolutions (N revolutions / minute) is detected by the revolution number detection unit 103. If the IC cart has illegal wiring, the illegal wiring is interposed between the rollers 101A and 101B, and the load due to the illegal wiring is applied to the first feed roller 101, and the rotation detected by the rotation speed detection unit 103. The number is M rotations / minute (M <N), which is lower than that of a regular IC card without illegal wiring.
Here, when the rotation speed n detected by the rotation speed detection unit 103 is N−α ≦ n ≦ N + β (0 ≦ α, 0 ≦ β), the IC card 110 is connected to the terminal of the IC card and the phone. It is set so that it is transported to the final position where it can come into contact with the pin to enable communication, and in other cases it is not transported to the final position or communication is not performed. α and β are determined appropriately so that the presence or absence of unauthorized wiring can be determined.
If there is unauthorized wiring, M <N−α, and the unauthorized IC card is not transported to the final position where the IC card terminal and the contact pin of the telephone can contact (contact) or contact with the contact pin even if transported. (Contact) I can't.
[0008]
The first feed roller 101 and the second feed roller 102 in this embodiment both hold the IC card 110 from both sides and convey the IC card 110 by the rotational force of the rollers, and there is no IC card. In this case, the rollers 101A and 101B and the rollers 102A and 102B are in contact with each other.
In the present embodiment, the rotational speed of the first feed roller 101 is detected, but a pair of rollers (not shown) different from the first feed roller 101 are separately provided for rotation. The number may be detected.
[0009]
【The invention's effect】
As described above, the present invention can detect the presence / absence of unauthorized wiring of an IC card by detecting the number of rotations of the first feed roller of the telephone. It is possible to prevent illegal electric signals from being input from outside.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a telephone according to an embodiment. FIG. 2 is a diagram showing an example of an IC card having illegal wiring.
DESCRIPTION OF SYMBOLS 100 Public telephone 101 1st feed roller 101A, 101B roller 102 2nd feed roller 102A, 102B roller 103 Rotational speed detection part 104 Contact 105 Contact pin 106 Card insertion slot 110 IC card

Claims (1)

A telephone in an IC card utilization system in which an IC card is inserted into a card insertion slot of a telephone and the terminal of the IC card and the contact pin of the telephone are brought into contact with each other. A first feed roller that transports the IC card, and a second feed roller that transports the IC card to the final position where the IC card terminal and the contact pin of the telephone can come into contact with each other. In use, after the IC card reaches the second feed roller, moves away from the first feed roller and starts transporting to the final position, the rotation direction for inserting the first feed roller into the card is opposite. Only when the detected number of rotations per specified time is within the specified value, Conveying the de until the final position, the contact pins into contact with the IC card terminal, and performs communications telephone.

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